Update Makefile and install script

fzf may not run correctly on some OS even when the binary the platform
is successfully downloaded. The install script is updated to check if
the system has no problem running the executable and fall back to Ruby
version when necessary.

install

@@ -2,8 +2,8 @@
 
 version=0.9.0
 
-cd `dirname $BASH_SOURCE`
-fzf_base=`pwd`
+cd $(dirname $BASH_SOURCE)
+fzf_base=$(pwd)
 
 ask() {
   read -p "$1 ([y]/n) " -n 1 -r
@@ -11,15 +11,26 @@ ask() {
   [[ ! $REPLY =~ ^[Nn]$ ]]
 }
 
+check_binary() {
+  echo "- Checking fzf executable"
+  echo -n "  - "
+  if ! "$fzf_base"/bin/fzf --version; then
+    binary_error="Error occurred"
+  fi
+}
+
 download() {
   echo "Downloading fzf executable ($1) ..."
   if [ -x "$fzf_base"/bin/fzf ]; then
-    ask "- fzf already exists. Download it again?" || return 0
+    if ! ask "- fzf already exists. Download it again?"; then
+      check_binary
+      return
+    fi
   fi
   mkdir -p "$fzf_base"/bin && cd "$fzf_base"/bin
   if [ $? -ne 0 ]; then
-    echo "- Failed to create bin directory."
-    return 1
+    binary_error="Failed to create bin directory"
+    return
   fi
 
   local url=https://github.com/junegunn/fzf-bin/releases/download/snapshot/${1}.tgz
@@ -28,35 +39,36 @@ download() {
   elif which wget > /dev/null; then
     wget -O - $url | tar -xz
   else
-    echo "- curl or wget required to download fzf executable."
-    return 1
+    binary_error="curl or wget not found"
+    return
   fi
 
   if [ ! -f $1 ]; then
-    echo "- Failed to download ${1}."
-    return 1
+    binary_error="Failed to download ${1}"
+    return
   fi
 
-  mv $1 fzf && chmod +x fzf && cd - > /dev/null && echo
+  mv $1 fzf && chmod +x fzf && check_binary
 }
 
 # Try to download binary executable
 archi=$(uname -sm)
-downloaded=0
-binary_available=0
+binary_available=1
+binary_error=""
 if [ "$archi" = "Darwin x86_64" ]; then
-  binary_available=1
-  download fzf-$version-darwin_amd64 && downloaded=1
+  download fzf-$version-darwin_amd64
 elif [ "$archi" = "Linux x86_64" ]; then
-  binary_available=1
-  download fzf-$version-linux_amd64 && downloaded=1
+  download fzf-$version-linux_amd64
+else
+  binary_available=0
 fi
 
-if [ $downloaded -ne 1 ]; then
+cd "$fzf_base"
+if [ -n "$binary_error" ]; then
   if [ $binary_available -eq 0 ]; then
-    echo -n "No prebuilt binary for $archi ... "
+    echo "No prebuilt binary for $archi ... "
   else
-    echo -n "Failed to download binary executable ... "
+    echo "  - $binary_error ... "
   fi
   echo "Installing legacy Ruby version ..."
 
@@ -304,7 +316,7 @@ if [ -n "$(which fish)" ]; then
   has_fish=1
   echo -n "Generate ~/.config/fish/functions/fzf.fish ... "
   mkdir -p ~/.config/fish/functions
-  if [ $downloaded -eq 0 ]; then
+  if [ -n "$binary_error" ]; then
     cat > ~/.config/fish/functions/fzf.fish << EOFZF
 function fzf
   $fzf_cmd \$argv

src/Makefile

@@ -44,8 +44,8 @@ clean:
 docker:
 	docker build -t junegunn/ubuntu-sandbox .
 
-linux64:
+linux64: docker
 	docker run -i -t -u jg -v $(shell cd ..; pwd):/fzf junegunn/ubuntu-sandbox \
 		/bin/bash -ci 'cd ~jg/go/src/github.com/junegunn/fzf/src; make'
 
-.PHONY: build release install linux64 clean docker run
+.PHONY: build release install linux64 clean docker